(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Set The Bar High by SimiC (on 7. January 2022, 10:20) | 28 |  99 % |
| Complete Achromatopsia by angel_shaaark (on 5. June 2022, 10:25) | 36 | 95 % |
| A-Sums Sudoku (5) by ICHTUES (on 6. November 2022, 06:00) | 26 | 96 % |
| Orange & Blue by FJL (on 4. December 2022, 15:45) | 26 | 92 % |
| Check the corners by Stoer (on 18. April 2023, 15:13) | 33 | 90 % |
| The Border Parity Act by Kjupatrick (on 10. March 2026, 09:56) | 26 | 92 % |
| Chaos Karussell VI by Luigi (on 16. September 2011, 10:15) | 49 | 94 % |
| Entanglement by Jay Dyer (on 25. July 2024, 16:15) | 264 | 97 % |
| Fractured Symmetry by Rab3aron (on 28. February 2026, 19:26) | 111 | 98 % |
| KUBA - Buchstabenrätsel by DocLogic (on 3. January 2020, 21:40) | 47 | 95 % |
| X-Parity by LKegel (on 19. February 2021, 17:31) | 23 | 96 % |
| Totem Art by tenaliraman (on 14. April 2021, 15:32) | 22 | 95 % |
| The Mine by FKlauser (on 18. April 2021, 20:30) | 26 | 91 % |
| Ring Of Entropy by crispy16 (on 7. September 2022, 15:56) | 31 | 97 % |
| pionOeno (Chaos Construction, 6x6) by thoughtbyte (on 5. October 2022, 21:56) | 25 | 90 % |
| Dotted around [Kropki Deconstruction] by Christounet (on 10. February 2023, 22:41) | 119 | 97 % |
| Entropic Paradox by XeonRisq (on 1. February 2023, 15:00) | 43 | 95 % |
| Heated Sum Loop by yttrio (on 1. March 2024, 21:06) | 46 | 97 % |
| No Kings by Merdock (on 31. August 2025, 03:04) | 50 | 96 % |
| XV Thermo Sudoku by Quarterthru (on 28. February 2021, 12:00) | 69 | 91 % |
